Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle

 

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dc.contributor.author February, Sean
dc.contributor.author Clarkson, Chris
dc.contributor.author Maartens, Roy
dc.date.accessioned 2016-08-13T18:04:17Z
dc.date.available 2016-08-13T18:04:17Z
dc.date.issued 19
dc.identifier.citation February, S., Clarkson, C., & Maartens, R. (2013). Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle. Journal of Cosmology and Astroparticle Physics, 2013(03), 023. en_ZA
dc.identifier.issn 1475-7516 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/21222
dc.description.abstract A suggested solution to the dark energy problem is the void model, where accelerated expansion is replaced by Hubble-scale inhomogeneity. In these models, density perturbations grow on a radially inhomogeneous background. This large scale inhomogeneity distorts the spherical Baryon Acoustic Oscillation feature into an ellipsoid which implies that the bump in the galaxy correlation function occurs at different scales in the radial and transverse correlation functions. We compute these for the first time, under the approximation that curvature gradients do not couple the scalar modes to vector and tensor modes. The radial and transverse correlation functions are very different from those of the concordance model, even when the models have the same average BAO scale. This implies that if void models are fine-tuned to satisfy average BAO data, there is enough extra information in the correlation functions to distinguish a void model from the concordance model. We expect these new features to remain when the full perturbation equations are solved, which means that the radial and transvers. en_ZA
dc.language eng en_ZA
dc.publisher IOP Publishing en_ZA
dc.source Journal of Cosmology and Astroparticle Physics en_ZA
dc.source.uri http://iopscience.iop.org/journal/1475-7516
dc.subject.other galaxy clustering
dc.subject.other baryon acoustic oscillations
dc.subject.other cosmological perturbation theory
dc.title Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle en_ZA
dc.type Journal Article en_ZA
dc.date.updated 2016-08-12T09:29:22Z
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation February, S., Clarkson, C., & Maartens, R. (19). Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle. <i>Journal of Cosmology and Astroparticle Physics</i>, http://hdl.handle.net/11427/21222 en_ZA
dc.identifier.chicagocitation February, Sean, Chris Clarkson, and Roy Maartens "Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle." <i>Journal of Cosmology and Astroparticle Physics</i> (19) http://hdl.handle.net/11427/21222 en_ZA
dc.identifier.vancouvercitation February S, Clarkson C, Maartens R. Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle. Journal of Cosmology and Astroparticle Physics. 19; http://hdl.handle.net/11427/21222. en_ZA
dc.identifier.ris TY - Journal Article AU - February, Sean AU - Clarkson, Chris AU - Maartens, Roy AB - A suggested solution to the dark energy problem is the void model, where accelerated expansion is replaced by Hubble-scale inhomogeneity. In these models, density perturbations grow on a radially inhomogeneous background. This large scale inhomogeneity distorts the spherical Baryon Acoustic Oscillation feature into an ellipsoid which implies that the bump in the galaxy correlation function occurs at different scales in the radial and transverse correlation functions. We compute these for the first time, under the approximation that curvature gradients do not couple the scalar modes to vector and tensor modes. The radial and transverse correlation functions are very different from those of the concordance model, even when the models have the same average BAO scale. This implies that if void models are fine-tuned to satisfy average BAO data, there is enough extra information in the correlation functions to distinguish a void model from the concordance model. We expect these new features to remain when the full perturbation equations are solved, which means that the radial and transvers. DA - 19 DB - OpenUCT DP - University of Cape Town J1 - Journal of Cosmology and Astroparticle Physics LK - https://open.uct.ac.za PB - University of Cape Town PY - 19 SM - 1475-7516 T1 - Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle TI - Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle UR - http://hdl.handle.net/11427/21222 ER - en_ZA


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